LID DEVICE OF UNDERGROUND BURIED BOX

PROBLEM TO BE SOLVED: To provide a lid device of an underground buried box capable of being installed in the existing underground buried box B without processing or changing of an opening and closing lid, preventing a third person from entering the box without notice and preventing the corrosion of an inside lid with eliminating countermeasures against dust proofing/waterproofing of a cylinder lock. SOLUTION: An opening section 2 of an upper wall 1 of the underground buried box B can be closed with a double lid structure formed of an upper lid 22 and the lock device 50 attached inside lid 41, and the inside lid 41 is constituted of a thermal insulating material such as a Ductile (R) or the like. Particularly, an inside lid supporting frame body 31 mounting and supporting the inside lid 41 is fixed to a wall surface in the opening section 2, and the lock device 50 is so constituted that the inside lid 41 can be connected to the inside lid supporting frame body 31. The lock device 50 places the cylinder lock 53 downward of a cap 52 and, at the same time, a swinging interlocking mechanism 54 equipped with a lock piece 68 capable of being interlocked with the inside lid supporting frame body 31 is swingably provided downward of the cylinder lock. COPYRIGHT: (C)2005,JPO&NCIPI